Unless your airplane requires zero mix you can`t understand the perfection of flight on a pattern model.
Tony,I dare say your running mix now, and a strake to Boot! is the Contra destabilizing your airplane ,,How could that make it better?
and where is the improvement! you really baggered me at the Nats for running one on the Valiant and laughed when I told you the reason for it.



I hope the Contra is an improvement, I`m making a large investment in the Idea by designing and importing an airplane around it.
I`m all about advancing the great Ideas in this Hobby and Brenner has a Beautiful unit, I admire it weekly.

I`m still very invested in the glow airplanes and what they deliver, they can be made to fly better than Electric with more flexibility in speed for conditions and breaking for flow control, with 2 times the flying time per flight. The new 1.75 is a beast of a motor and the easiest YS to run in years. we are running the same diameter prop as electric with better braking force, off throttle ,cruse and idle.

However I wan`t to work with the contra system.I won`t be relying on it to improve the flying, or trimming, Just to improve the flexibility of power/brake setup.thats a tough Challenge over what I`m now using.
If you know me I will admit when I`m Wrong But till now, the things the Contra is supposed to fix because of "spiral Slip stream" I have already fixed with perfect trimming on a single prop glow setup.
If the contra is better you Know I will be the first to switch and admit I was wrong
I`m already trimming with no mix so it can only get better right
If trimming a airplane for no mix was not important, why would anyone invest 2-3000.00 bucks for a contra setup to improve the mix like the claimes I hear here?

I already have designs that use no right thrust and no down thrust, the Shinden being one of them, it`s Glow so that rules that argument out.
it also has no need for reversed trimmed elevator halves to fly both knifes and has no roll out .pitch out on knife edge loops, no mix on any intergrated rolling of any kind, every input is pure with no need to guess a counter hold on other control surfaces. Until you fly an airplane this pure you can`t quantify it.

I hear thing beat around like (if we make the nose skinny the airplane will fly more pure with the Contra units to help with yaw ) or reflexing the TE of the surfaces will make it better and less sensitive around neutral. or I have a draggy fuse it`s better for speed control. These things are not boats. Yes reflex on the surfaces do work But it`s another bandaid.
The airplane flies on the Wings, and this is where 60% of the drag is the other 40 is in the prop and gear the wing is where 100% of the flying is, This is where we need to do all the adjustments and modifications. Eveywhere else on the model except the Engine/Prop is a waste in effort to improve the flying compaired to what is gained on the wings.

I know what causes reverse knife issues I fix them over the Net every week ,the guys flyng sportsman do it through e-mail.
I know what causes the Need for down thrust ,and the effects or affects of using it has to trimming and what it degrades in setup.
I know what causes the need for right thrust and why we use it I know the design flaws that require it, its not yaw,"P" effect, or spiral slip stream
I know what causes the need for left rudder to thottle mix.
I know what causes pull in the up lines.


Do you think I would be this bold in public if I could be proven wrong
has any one ever told me I was full of SH^*(well don`t go by that)
I challenge anybody to meet with me with their airplane, using any system I`l prove it!, be prepaired to re-learn your habits of flying around that stuff.

BY the way no body Asked me to prove I know "spiral slip stream " does not cause a knife edge tuck to the belly on left rudder and pull to the canopy on right rudder.

I have learned over the years that Great fliers make poor trimmers and they just don`t understand what the fuss is all about.
Trust me I work with great flyers, they would rather mix it out than be bothered into knowing the reasons why it needs to be fixed.

I wish I could write and Nice and Elegant as Dave But these are my ramblings, the information here is no joke, provable and not meant to step on toes or sound high and mighty. I just get tired of old bad information rehashed to a new generation of trimmers.

Dean Pappas put the fire under me 25 years ago with the desire to search for perfection. I hope I can pass this along to a new generation.
I promised My self I would avoid RCU on this topic and address it on my website ,,But I couldn`t help it
Holdng the truth and not sharing was killing me LOL

Bryan